If Penny didn't know that Leslie had turned me down, then it would unambiguously mean that she, Penny, thought I should ask her, Leslie, out, indicating that she had no interest in me asking her, Penny, out.
Si la Penny no hagués sabut que la Leslie m'havia rebutjat, aleshores, de forma inequívoca, significaria... que ella, Penny, pensaria que hauria de demanar a la Leslie per sortir, el que indica que ella no té cap interès en que la convidi per sortir.